Which component is present in natural gas and occupies 10%-20% of its composition?

Ethane is indeed a significant component of natural gas, typically making up about 10% to 20% of its overall composition. The primary composition of natural gas is dominated by methane, which constitutes the majority; however, ethane is the second most abundant hydrocarbon found within it.

Ethane (C2H6) can be separated from natural gas for use as a feedstock in petrochemical processes, particularly in the production of ethylene, which is a key component in many plastics and chemicals. Understanding the composition and the role of various hydrocarbons is crucial for those involved in power engineering, as it impacts combustion efficiency, energy content, and the protocols for processing natural gas for various applications.

While propane and butane are also present in natural gas, they generally appear in smaller amounts compared to ethane. Methane is the main constituent but does not fall within the 10%-20% range specified in the question related to ethane. Thus, ethane accurately fits the criteria provided.